Figure 2
Figure 2: (a) Liquid jet breaking up below the liquid surface. A number of forming and newly born antibubbles can be seen (b)The liquid flow from the beaker passes through the air-liquid interface and forms a liquid jet beneath the surface. This jet then breaks up to form antibubbles due to the Rayleigh-Plateau instability (image credit: S Dorbolo et al. 2004 New J. Phys. 5 161).